29 September 1979: broadcast of first episode of City of Death. The Doctor and Romana are in Paris, and get mixed up with Duggan the detective and Count and Countess Scarlioni. But the Count is more than he seems...
29 September 2007: broadcast of both episodes of The Last Sontaran, starting Season 2 of the Sarah Jane Adventures. A surviving Sontaran from The Sontaran Stratagem/The Poison Sky tries to destroy human life on Earth, but is thwarted by Sarah Jane, Luke, Clyde and Maria. But (sob!) Maria is moving to America and we won't see much more of her.